w to jump(and hopefully dodge snowballs) for player 1 s to throw a snowball up arrow to jump for player 2 down arrow to throw a snowball hitting snowballs destroys the snowballs, allowing you to defend against attacks. p2 throws faster and has more health points than p1. Also throws faster snowballs p1 jumps higher and throws bigger snow balls.
I tried to make them as balanced as possible with different stats so it may seem in favour of p2.